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Semi-related tangent, this is Bertrand Russell on Wittgenstein from the epigraph of Markson's book Wittgenstein's Mistress:

"When I was still doubtful as to his ability, I asked G.E. Moore for his opinion. Moore replied, 'I think very well of him indeed.' When I enquired the reason for his opinion, he said that it was because Wittgenstein was the only man who looked puzzled at his lectures."